Addition of Three 3-Digit Numbers
We will learn addition of three 3-digit numbers.
Addition of Three 3-Digit Numbers Without Regrouping:
Adding three 3-digit numbers is same as adding two 3-digit numbers.
For examples:
Add 423112 and 260.
Solution:
|
Step 1: Arrange the numbers vertically. Step 2: First add the ones. 3 + 2 + 0 = 5 Step 3: Now, add the tens. 2 + 1 + 6 = 9 Step 4: Lastly, add the hundreds. 4 + 1 + 2 = 7 |
 Thus, 423 + 112 + 260 = 795 |
Addition of Three 3-Digit Numbers With Regrouping:
|
Add 497, 125 and 124. Solution: Step 1: Arrange the numbers vertically. Step 2: Add the ones column. 7 + 5 + 4 = 16 ones = 1 ten and 6 ones. Write 6 in the ones column and carry over 1 to the tens column. Step 3: Add the tens column. 9 + 2 + 2 + 1 (carry over) = 14 tens = 1 hundred and 4 tens. Write 4 in the tens column and carry over 1 to the hundreds column. Step 4: Add the hundreds column. 4 + 1 + 1 + 1 (carry over) = 7 hundreds. |
 Thus, 497 + 125 + 124 = 746 |
Questions and Answers on Addition of Three 3-Digit Numbers:
1. Add the following Three 3-Digit Numbers Without Regrouping:
(i) 132 + 125 + 432
(ii) 320 + 220 + 459
(iii) 133 + 206 + 630
(iv) 351 + 133 + 400
(v) 233 + 654 + 11
(vi) 561 + 125 + 112
(vii) 615 + 131 + 202
(viii) 810 + 125 + 53
Answer:
1. (i) 132 + 125 + 432
(ii) 320 + 220 + 459
(iii) 133 + 206 + 630
(iv) 351 + 133 + 400
(v) 233 + 654 + 11
(vi) 561 + 125 + 112
(vii) 615 + 131 + 202
(viii) 810 + 125 + 53
2. Add the following Three 3-Digit Numbers With Regrouping:
(i) 281 + 435 + 209
(ii) 355 + 321 + 189
(iii) 240 + 107 + 573
(iv) 286 + 233 + 249
(v) 222 + 437 + 150
(vi) 109 + 420 + 371
(vii) 175 + 215 + 301
(viii) 482 + 239 + 101
Answer:
2. (i) 281 + 435 + 209
(ii) 355 + 321 + 189
(iii) 240 + 107 + 573
(iv) 286 + 233 + 249
(v) 222 + 437 + 150
(vi) 109 + 420 + 371
(vii) 175 + 215 + 301
(viii) 482 + 239 + 101
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